Are the Virgin tivos as user friendly (or incredibly superior??) to the series 1 then?
Not quite as user friendly (definitely not incredibly superior, more a bit inferior) but not bad. Certainly massively better than the Sky+ system which I struggled to use at my mum's this weekend.
It's very familiar to a Series 1 TiVo user - mostly the problem is where it's spoiled by branding (i.e. everything hideous heavy red) and by being skewed to their commercial imperatives instead of what the user might want (e.g. you can't just set a preference to have the guide never show you channels you don't get - you can carefully tune your favourites, and choose to see just favourites, but it goes back to all regularly; and other filters such as "films" show all film channels: presumably to constantly encourage you to upgrade your package).
But: it has three tuners instead of one, so a clash is a very rare thing; it's all digital so the picture and sound quality is very much better; and it integrates with the internet in cunning ways.
But mainly I didn't switch to get a different TiVo, but to get the Virgin package (my broadband supplier - O2 - was sold to Sky and I hate giving money to Murdoch, and SWMBO was demanding channels we don't get on freeview). I ran the two TiVos in parallel for a while, but we just stopped using the Series 1, and at some point I unplugged it for some reason... and months later noticed it had never been plugged back in. So time to find it a home where it will be appreciated, before it's too late... if it isn't too late already.